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(#) Icon density-independent size validation

!!! WARNING: Icon density-independent size validation
   This is a warning.

Id
:   `IconDipSize`
Summary
:   Icon density-independent size validation
Severity
:   Warning
Category
:   Usability: Icons
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   Initial
Affects
:   Resource files
Editing
:   This check can *not* run live in the IDE editor
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/IconDetector.java)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/IconDetectorTest.java)
Copyright Year
:   2011

Checks the all icons which are provided in multiple densities, all
compute to roughly the same density-independent pixel (`dip`) size. This
catches errors where images are either placed in the wrong folder, or
icons are changed to new sizes but some folders are forgotten.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
res/drawable-mdpi/my_lossy_72dp.webp:Warning: Suspicious file name
my_lossy_72dp.webp: The implied 72 dp size does not match the actual dp
size (pixel size 58×56 in a drawable-mdpi folder computes to 58×56 dp)
[IconDipSize]
0 errors, 3 warnings
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here are the relevant test files:

![res/drawable-mdpi/my_lossy_72dp.webp](examples/drawable-mdpi/my_lossy_72dp.webp)

![res/mipmap-mdpi/my_lossy2_72dp.webp](examples/mipmap-mdpi/my_lossy2_72dp.webp)

![res/drawable-mdpi/my_lossless_72dp.webp](examples/drawable-mdpi/my_lossless_72dp.webp)

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/IconDetectorTest.java)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `IconDetector.testClaimedSizeWebp`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="IconDipSize" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'IconDipSize'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore IconDipSize ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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